STRUCTURE OF THE BORATE LI14BE5B(BO3)9

The new compound Li14Be5B(BO3)9 has been synthesized and structurally characterized by single-crystal X-ray methods. It crystallizes in the hexagonal system (space group P6(3)/m, Z = 2) in a cell of dimensions a = 7.730(2) angstrom, c = 18.853(2) angstrom, and V = 975.5(3) angstr om3. The model has been refined with 1725 unique reflections to the fi nal residuals R = 0.048 and R(w) = 0.067. LiO3 and BO3 triangles, LiO4 and BeO4 tetrahedra, and LiO6 trigonal prisms join by sharing vertice s to form a unique, dense three-dimensional structure.